8138270405 has 4 divisors (see below), whose sum is σ = 9765924492. Its totient is φ = 6510616320.

The previous prime is 8138270401. The next prime is 8138270419. The reversal of 8138270405 is 5040728318.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2254920196 + 5883350209 = 47486^2 + 76703^2 .

It is not a de Polignac number, because 8138270405 - 2² = 8138270401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8138270401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813827036 + ... + 813827045.

It is an arithmetic number, because the mean of its divisors is an integer number (2441481123).

Almost surely, 2^8138270405 is an apocalyptic number.

It is an amenable number.

8138270405 is a deficient number, since it is larger than the sum of its proper divisors (1627654087).

8138270405 is a wasteful number, since it uses less digits than its factorization.

8138270405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627654086.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 8138270405 is about 90212.3628168557. The cubic root of 8138270405 is about 2011.4567795354.

The spelling of 8138270405 in words is "eight billion, one hundred thirty-eight million, two hundred seventy thousand, four hundred five".